About HTML File Compare
Compare HTML templates, email layouts, or page source to track structural changes — added tags, attribute edits, and content rewrites. Full HTML syntax highlighting in both panes.
Frequently Asked Questions
What is an HTML diff tool?
An HTML diff tool compares two HTML documents and highlights every markup difference — added tags in green, removed tags in red, and changed attribute values inline. It is useful for reviewing template changes, A/B test variants, and CMS output differences.
What is the difference between a word diff and a line diff for HTML?
A line diff highlights entire lines that changed. A word diff highlights the specific words or tokens within a line that changed, leaving unchanged words on the same line uncoloured. Word diff gives a much clearer picture of small edits within long lines — common with HTML where attributes and tag content share a line.
Can an HTML diff tool compare rendered output rather than source markup?
This tool compares raw HTML source, not rendered output. Two HTML files that render identically can have very different source (different tag order, equivalent attributes, whitespace). For visual regression testing (comparing how a page looks in a browser), use Playwright or Percy, which screenshot-diff rendered pages.
How do I find what changed between two versions of a webpage?
Copy the HTML source of the old version (View Source or save from git history) into the left panel and the new version into the right. The diff highlights changed attributes, new elements, and removed sections. Combine with the browser's DevTools "Compare" feature for full-page structural diffing.
Is my HTML code sent to a server when using this online diff tool?
No. All diffing runs in your browser — your HTML never leaves your device. This is safe for internal application templates, proprietary component code, or HTML containing personally identifiable information in text content.
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